Lobster rolls are on every menu it seems right now, but few get is right. The ones served in Boston and Cape Cod have very little mayo and the lobster is the real focus of the meal.At Smoked and Cracked the East Coast version (cold – $22) is perfection. The sandwich arrives with huge chunks of lobster, dressed ever-so-lightly with mayo and fresh tarragon on a grilled bun.It’s achingly simple, but exactly how it should be.